<!DOCTYPE html>



  


<html class="theme-next gemini use-motion" lang="zh-Hans">
<head><meta name="generator" content="Hexo 3.9.0">
  <meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="theme-color" content="#222">









<meta http-equiv="Cache-Control" content="no-transform">
<meta http-equiv="Cache-Control" content="no-siteapp">
















  
  
  <link href="/blog/lib/fancybox/source/jquery.fancybox.css?v=2.1.5" rel="stylesheet" type="text/css">







<link href="/blog/lib/font-awesome/css/font-awesome.min.css?v=4.6.2" rel="stylesheet" type="text/css">

<link href="/blog/css/main.css?v=5.1.4" rel="stylesheet" type="text/css">


  <link rel="apple-touch-icon" sizes="180x180" href="/blog/images/apple-touch-icon-next.png?v=5.1.4">


  <link rel="icon" type="image/png" sizes="32x32" href="/blog/images/favicon-32x32-next.png?v=5.1.4">


  <link rel="icon" type="image/png" sizes="16x16" href="/blog/images/favicon-16x16-next.png?v=5.1.4">


  <link rel="mask-icon" href="/blog/images/logo.svg?v=5.1.4" color="#222">





  <meta name="keywords" content="Vue哪儿网App实战,">










<meta name="description" content="本专题为Vue2.5的入门和实战的视频学习笔记，学习视频来自：入门视频：《vue2.5入门》 http://www.imooc.com/learn/980实战视频：《Vue2.5开发去哪儿网App 从零基础入门到实战项目》 https://coding.imooc.com/class/chapter/203.html 本文为入门篇的第一章，主要讲解Vue的基础知识">
<meta name="keywords" content="Vue哪儿网App实战">
<meta property="og:type" content="article">
<meta property="og:title" content="【入门篇——第一章】Vue2.5入门到实战开发去哪儿网App——Vue的基础知识">
<meta property="og:url" content="https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/index.html">
<meta property="og:site_name" content="Aiolos">
<meta property="og:description" content="本专题为Vue2.5的入门和实战的视频学习笔记，学习视频来自：入门视频：《vue2.5入门》 http://www.imooc.com/learn/980实战视频：《Vue2.5开发去哪儿网App 从零基础入门到实战项目》 https://coding.imooc.com/class/chapter/203.html 本文为入门篇的第一章，主要讲解Vue的基础知识">
<meta property="og:locale" content="zh-Hans">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920102506335.jpg">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920104125811.jpg">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920115953619.jpg">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920120130923.jpg">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920130238913.jpg">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920131051024.jpg">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920141327394.jpg">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920141925925.jpg">
<meta property="og:image" content="https://aiolos123.gitee.io/blog/images/20190920142723267.jpg">
<meta property="og:updated_time" content="2019-10-10T09:15:08.384Z">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="【入门篇——第一章】Vue2.5入门到实战开发去哪儿网App——Vue的基础知识">
<meta name="twitter:description" content="本专题为Vue2.5的入门和实战的视频学习笔记，学习视频来自：入门视频：《vue2.5入门》 http://www.imooc.com/learn/980实战视频：《Vue2.5开发去哪儿网App 从零基础入门到实战项目》 https://coding.imooc.com/class/chapter/203.html 本文为入门篇的第一章，主要讲解Vue的基础知识">
<meta name="twitter:image" content="https://aiolos123.gitee.io/blog/images/20190920102506335.jpg">



<script type="text/javascript" id="hexo.configurations">
  var NexT = window.NexT || {};
  var CONFIG = {
    root: '/blog/',
    scheme: 'Gemini',
    version: '5.1.4',
    sidebar: {"position":"left","display":"post","offset":12,"b2t":false,"scrollpercent":false,"onmobile":false},
    fancybox: true,
    tabs: true,
    motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
    duoshuo: {
      userId: '0',
      author: '博主'
    },
    algolia: {
      applicationID: '',
      apiKey: '',
      indexName: '',
      hits: {"per_page":10},
      labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
    }
  };
</script>



  <link rel="canonical" href="https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/">





  <title>【入门篇——第一章】Vue2.5入门到实战开发去哪儿网App——Vue的基础知识 | Aiolos</title>
  








</head>

<body itemscope itemtype="http://schema.org/WebPage" lang="zh-Hans">

  
  
    
  

  <div class="container sidebar-position-left page-post-detail">
    <div class="headband"></div>

    <header id="header" class="header" itemscope itemtype="http://schema.org/WPHeader">
      <div class="header-inner"><div class="site-brand-wrapper">
  <div class="site-meta ">
    

    <div class="custom-logo-site-title">
      <a href="/blog/" class="brand" rel="start">
        <span class="logo-line-before"><i></i></span>
        <span class="site-title">Aiolos</span>
        <span class="logo-line-after"><i></i></span>
      </a>
    </div>
      
        <p class="site-subtitle">记录我的成长点滴</p>
      
  </div>

  <div class="site-nav-toggle">
    <button>
      <span class="btn-bar"></span>
      <span class="btn-bar"></span>
      <span class="btn-bar"></span>
    </button>
  </div>
</div>

<nav class="site-nav">
  

  
    <ul id="menu" class="menu">
      
        
        <li class="menu-item menu-item-home">
          <a href="/blog/" rel="section">
            
              <i class="menu-item-icon fa fa-fw fa-home"></i> <br>
            
            首页
          </a>
        </li>
      
        
        <li class="menu-item menu-item-tags">
          <a href="/blog/tags/" rel="section">
            
              <i class="menu-item-icon fa fa-fw fa-tags"></i> <br>
            
            标签
          </a>
        </li>
      
        
        <li class="menu-item menu-item-categories">
          <a href="/blog/categories/" rel="section">
            
              <i class="menu-item-icon fa fa-fw fa-th"></i> <br>
            
            分类
          </a>
        </li>
      
        
        <li class="menu-item menu-item-archives">
          <a href="/blog/archives/" rel="section">
            
              <i class="menu-item-icon fa fa-fw fa-archive"></i> <br>
            
            归档
          </a>
        </li>
      

      
        <li class="menu-item menu-item-search">
          
            <a href="javascript:;" class="popup-trigger">
          
            
              <i class="menu-item-icon fa fa-search fa-fw"></i> <br>
            
            搜索
          </a>
        </li>
      
    </ul>
  

  
    <div class="site-search">
      
  <div class="popup search-popup local-search-popup">
  <div class="local-search-header clearfix">
    <span class="search-icon">
      <i class="fa fa-search"></i>
    </span>
    <span class="popup-btn-close">
      <i class="fa fa-times-circle"></i>
    </span>
    <div class="local-search-input-wrapper">
      <input autocomplete="off" placeholder="搜索..." spellcheck="false" type="text" id="local-search-input">
    </div>
  </div>
  <div id="local-search-result"></div>
</div>



    </div>
  
</nav>



 </div>
    </header>

    <main id="main" class="main">
      <div class="main-inner">
        <div class="content-wrap">
          <div id="content" class="content">
            

  <div id="posts" class="posts-expand">
    

  

  
  
  

  <article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
  
  
  
  <div class="post-block">
    <link itemprop="mainEntityOfPage" href="https://aiolos123.gitee.io/blog/blog/2019/09/20/vue-learning-step-by-step-1/">

    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
      <meta itemprop="name" content="aiolos">
      <meta itemprop="description" content>
      <meta itemprop="image" content="/blog/images/avatar.gif">
    </span>

    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
      <meta itemprop="name" content="Aiolos">
    </span>

    
      <header class="post-header">

        
        
          <h1 class="post-title" itemprop="name headline">【入门篇——第一章】Vue2.5入门到实战开发去哪儿网App——Vue的基础知识</h1>
        

        <div class="post-meta">
          <span class="post-time">
            
              <span class="post-meta-item-icon">
                <i class="fa fa-calendar-o"></i>
              </span>
              
                <span class="post-meta-item-text">发表于</span>
              
              <time title="创建于" itemprop="dateCreated datePublished" datetime="2019-09-20T10:14:31+08:00">
                2019-09-20
              </time>
            

            

            
          </span>

          
            <span class="post-category">
            
              <span class="post-meta-divider">|</span>
            
              <span class="post-meta-item-icon">
                <i class="fa fa-folder-o"></i>
              </span>
              
                <span class="post-meta-item-text">分类于</span>
              
              
                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
                  <a href="/blog/categories/Vue/" itemprop="url" rel="index">
                    <span itemprop="name">Vue</span>
                  </a>
                </span>

                
                
              
            </span>
          

          
            
          

          
          

          

          

          

        </div>
      </header>
    

    
    
    
    <div class="post-body" itemprop="articleBody">

      
      

      
        <p>本专题为Vue2.5的入门和实战的视频学习笔记，学习视频来自：<br>入门视频：《vue2.5入门》 <a href="http://www.imooc.com/learn/980" target="_blank" rel="noopener">http://www.imooc.com/learn/980</a><br>实战视频：《Vue2.5开发去哪儿网App 从零基础入门到实战项目》 <a href="https://coding.imooc.com/class/chapter/203.html" target="_blank" rel="noopener">https://coding.imooc.com/class/chapter/203.html</a></p>
<p>本文为入门篇的第一章，主要讲解Vue的基础知识</p>
<a id="more"></a>

<blockquote>
<p>使用Vue的编程思路转换：开发者不会再有Dom的操作，想改变Dom上的数据内容只需改变Vue实例中的数据</p>
</blockquote>
<h1 id="Vue2-5入门篇"><a href="#Vue2-5入门篇" class="headerlink" title="Vue2.5入门篇"></a>Vue2.5入门篇</h1><p>Vue2.5入门篇的课程内容<br><img src="/blog/images/20190920102506335.jpg" alt="Vue2.5入门篇的课程内容"></p>
<p>Vue官网：<a href="https://cn.vuejs.org/" target="_blank" rel="noopener">https://cn.vuejs.org/</a></p>
<h1 id="Vue基础语法"><a href="#Vue基础语法" class="headerlink" title="Vue基础语法"></a>Vue基础语法</h1><h2 id="创建第一个Vue实例-直接用script标签引入vue-js"><a href="#创建第一个Vue实例-直接用script标签引入vue-js" class="headerlink" title="创建第一个Vue实例(直接用script标签引入vue.js)"></a>创建第一个Vue实例(直接用script标签引入vue.js)</h2><h3 id="创建实例"><a href="#创建实例" class="headerlink" title="创建实例"></a>创建实例</h3><p>参考官网教程：<a href="https://cn.vuejs.org/v2/guide/installation.html" target="_blank" rel="noopener">https://cn.vuejs.org/v2/guide/installation.html</a></p>
<ol>
<li>创建html页面，在head中引入vue.js</li>
</ol>
<p><strong>必须在head部分引入vue.js，否则会出现页面抖屏问题</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">title</span>&gt;</span>Vue入门<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 必须在head部分引入vue.js，否则会出现页面抖屏问题 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">"./vue.js"</span>&gt;</span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ol start="2">
<li><p>在html页面的body部分声明dom元素</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- 2. 声明dom --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>在html页面的body部分尾部编写创建vue实例的代码</p>
<figure class="highlight dts"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="params">&lt;script&gt;</span></span><br><span class="line">	<span class="comment">//3. 通过new Vue()创建Vue实例, 其中可以传递几个参数</span></span><br><span class="line">	new Vue(&#123;</span><br><span class="line"><span class="symbol">		el:</span> <span class="string">"#root"</span>, <span class="comment">//本vue实例绑定到哪个页面dom元素,本例为绑定到id=root的元素上</span></span><br><span class="line">		<span class="comment">// 存放vue实例的数据</span></span><br><span class="line"><span class="symbol">		data:</span>&#123;</span><br><span class="line"><span class="symbol">			msg:</span> <span class="string">"hello world"</span></span><br><span class="line">		&#125;</span><br><span class="line">	&#125;)</span><br><span class="line"><span class="params">&lt;/script&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>在浏览器中打开html页面，关键点是页面没有报错</p>
</li>
<li><p>在Dom元素中显示Vue实例中的数据</p>
<figure class="highlight django"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="comment">&lt;!-- 2. 声明dom --&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="comment">&lt;!-- 调用vue实例中的数据 --&gt;</span></span></span><br><span class="line"><span class="xml">	</span><span class="template-variable">&#123;&#123; msg &#125;&#125;</span><span class="xml"></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br></pre></td></tr></table></figure>

</li>
</ol>
<p>在Dom元素中显示Vue实例中的数据的效果如下：<br><img src="/blog/images/20190920104125811.jpg" alt="在Dom元素中显示Vue实例中的数据"></p>
<h3 id="总结Vue的使用步骤"><a href="#总结Vue的使用步骤" class="headerlink" title="总结Vue的使用步骤"></a>总结Vue的使用步骤</h3><ol>
<li>Vue实例绑定dom元素</li>
<li>在Dom中显示Vue实例中的数据</li>
</ol>
<h2 id="挂载点，模版与实例"><a href="#挂载点，模版与实例" class="headerlink" title="挂载点，模版与实例"></a>挂载点，模版与实例</h2><ol>
<li><p>挂载点: Vue实例绑定的DOM元素；</p>
<blockquote>
<p>挂载点的作用：Vue实例只处理挂载点下的内容</p>
</blockquote>
</li>
<li><p>模版： 挂载点内部的内容称为模板。</p>
<blockquote>
<p>挂载点的作用：模板可以写到Vue实例中的template属性上，也可以写到挂载点的内部</p>
</blockquote>
</li>
<li><p>Vue实例： new Vue()</p>
<blockquote>
<p>作用： Vue实例自动根据其内部定义的模板和数据，生成最终显示的内部并将其显示到挂载点上</p>
</blockquote>
</li>
</ol>
<h2 id="Vue实例中的数据-事件和方法"><a href="#Vue实例中的数据-事件和方法" class="headerlink" title="Vue实例中的数据,事件和方法"></a>Vue实例中的数据,事件和方法</h2><ol>
<li>在模板上显示Vue实例中的数据的两种方式<blockquote>
<p>插值表达式 或 v-text/v-html指令</p>
</blockquote>
</li>
</ol>
<figure class="highlight django"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="comment">&lt;!-- 1. 插值表达式 </span></span><span class="template-variable">&#123;&#123; xxx &#125;&#125;</span><span class="xml"><span class="comment"> --&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">h1</span>&gt;</span>haha,</span><span class="template-variable">&#123;&#123; msg &#125;&#125;</span><span class="xml"><span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">h2</span>&gt;</span></span><span class="template-variable">&#123;&#123; number &#125;&#125;</span><span class="xml"><span class="tag">&lt;/<span class="name">h2</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="comment">&lt;!-- 2. v-text指令/v-html：p元素显示的内容由变量number、content决定 --&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">p</span> <span class="attr">v-text</span>=<span class="string">"number"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">p</span> <span class="attr">v-text</span>=<span class="string">"content"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">p</span> <span class="attr">v-html</span>=<span class="string">"content"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span></span><br><span class="line"><span class="xml">	new Vue(&#123;</span></span><br><span class="line"><span class="xml">		el: "#root", //本vue实例绑定到哪个页面dom元素,本例为绑定到id=root的元素上</span></span><br><span class="line"><span class="xml">		//定义vue实例的数据</span></span><br><span class="line"><span class="xml">		data:&#123;</span></span><br><span class="line"><span class="xml">			msg: "hello world",</span></span><br><span class="line"><span class="xml">			number: 123,</span></span><br><span class="line"><span class="xml">			content: '<span class="tag">&lt;<span class="name">em</span>&gt;</span>html<span class="tag">&lt;/<span class="name">em</span>&gt;</span>'</span></span><br><span class="line"><span class="xml">		&#125;</span></span><br><span class="line"><span class="xml">	&#125;)</span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span></span><br></pre></td></tr></table></figure>

<ol start="2">
<li>在vue中，如何给元素绑定事件<blockquote>
<p>步骤: a. 通过v-on指令在元素上绑定事件；b. 在Vue实例的methods属性中定义触发事件的处理方法</p>
</blockquote>
</li>
</ol>
<figure class="highlight django"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="comment">&lt;!-- 2. 给模板标签绑定事件 --&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">v-on:click</span>=<span class="string">"changeMsg"</span>&gt;</span></span><span class="template-variable">&#123;&#123; msg &#125;&#125;</span><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span></span><br><span class="line"><span class="xml">	//3. 通过new Vue()创建Vue实例, 其中可以传递几个参数</span></span><br><span class="line"><span class="xml">	new Vue(&#123;</span></span><br><span class="line"><span class="xml">		el: "#root", //本vue实例绑定到哪个页面dom元素,本例为绑定到id=root的元素上</span></span><br><span class="line"><span class="xml">		//定义vue实例的数据</span></span><br><span class="line"><span class="xml">		data:&#123;</span></span><br><span class="line"><span class="xml">			msg: "hello world",</span></span><br><span class="line"><span class="xml">			number: 123,</span></span><br><span class="line"><span class="xml">			content: '<span class="tag">&lt;<span class="name">em</span>&gt;</span>html<span class="tag">&lt;/<span class="name">em</span>&gt;</span>'</span></span><br><span class="line"><span class="xml">		&#125;,</span></span><br><span class="line"><span class="xml">		//定义绑定事件的处理方法</span></span><br><span class="line"><span class="xml">		methods:&#123;</span></span><br><span class="line"><span class="xml">			//方法定义</span></span><br><span class="line"><span class="xml">			changeMsg: function() &#123;</span></span><br><span class="line"><span class="xml">				// this 代表当前Vue实例的data属性</span></span><br><span class="line"><span class="xml">				this.msg = "massage is changed"</span></span><br><span class="line"><span class="xml">			&#125;</span></span><br><span class="line"><span class="xml">		&#125;</span></span><br><span class="line"><span class="xml">	&#125;)</span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span></span><br></pre></td></tr></table></figure>

<p><strong>总结：</strong></p>
<blockquote>
<p>使用Vue后，不再是面向DOM编程，而是面向数据编程————开发者不会再有Dom的操作，想改变Dom上的数据内容只需改变Vue实例中的数据<br>只要数据发生变化，页面自动变化<br>v-on指令的简写形式————@</p>
</blockquote>
<h2 id="Vue中的属性绑定和双向数据绑定"><a href="#Vue中的属性绑定和双向数据绑定" class="headerlink" title="Vue中的属性绑定和双向数据绑定"></a>Vue中的属性绑定和双向数据绑定</h2><ol>
<li>使用v-bind指令实现Vue中的属性绑定<blockquote>
<p>v-bind指令的简写形式————:</p>
</blockquote>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">title</span>=<span class="string">"this is hello world"</span>&gt;</span>hello world<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">v-bind:title</span>=<span class="string">"t"</span>&gt;</span>hello world<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">	<span class="comment">&lt;!-- 使用指令后，t变为一个JS变量 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">:title</span>=<span class="string">"' dell li '+t"</span>&gt;</span>hello world<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="actionscript">	<span class="keyword">new</span> Vue(&#123;</span></span><br><span class="line"><span class="actionscript">		el: <span class="string">"#root"</span>,</span></span><br><span class="line"><span class="actionscript">		<span class="comment">//定义数据</span></span></span><br><span class="line">		data:&#123;</span><br><span class="line"><span class="actionscript">			t: <span class="string">'this is new hello world'</span></span></span><br><span class="line">		&#125;</span><br><span class="line">	&#125;)</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>

</li>
</ol>
<p>使用v-bind指令实现Vue中的属性绑定的效果如下：<br><img src="/blog/images/20190920115953619.jpg" alt="使用v-bind指令实现Vue中的属性绑定"></p>
<ol start="2">
<li>使用v-model实现双向数据绑定<blockquote>
<p>单向数据绑定： Vue中的数据决定页面显示内容；页面显示内容无法决定Vue中的数据<br>双向数据绑定： Vue中的数据决定页面显示内容；页面显示内容也能决定Vue中的数据</p>
</blockquote>
</li>
</ol>
<figure class="highlight django"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="comment">&lt;!-- 2. 双向数据绑定 使用v-model实现双向数据绑定--&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">v-model</span>=<span class="string">"content"</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">div</span>&gt;</span></span><span class="template-variable">&#123;&#123; content &#125;&#125;</span><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span></span><br><span class="line"><span class="xml">	new Vue(&#123;</span></span><br><span class="line"><span class="xml">		el: "#root",</span></span><br><span class="line"><span class="xml">		//定义数据</span></span><br><span class="line"><span class="xml">		data:&#123;</span></span><br><span class="line"><span class="xml">			title: 'this is new hello world',</span></span><br><span class="line"><span class="xml">			content: 'this is content'</span></span><br><span class="line"><span class="xml">		&#125;</span></span><br><span class="line"><span class="xml">	&#125;)</span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span></span><br></pre></td></tr></table></figure>

<p>使用v-model实现双向数据绑定的效果如下(在input框输入内容，下方的内容同步变化)：<br><img src="/blog/images/20190920120130923.jpg" alt="使用v-model实现双向数据绑定"></p>
<h2 id="Vue中的计算属性和侦听器"><a href="#Vue中的计算属性和侦听器" class="headerlink" title="Vue中的计算属性和侦听器"></a>Vue中的计算属性和侦听器</h2><ol>
<li>计算属性<blockquote>
<p>计算属性：某个属性是通过其他数据或属性计算得到的，这个属性就称为计算属性；<br>计算属性定义在computed属性中</p>
</blockquote>
</li>
</ol>
<p><strong>小结：Vue实例中的data属性中定义的是’静态’属性；computed属性中定义的是计算属性；<br>它们的使用方式同data属性中的属性完全一致</strong></p>
<figure class="highlight django"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span></span><br><span class="line"><span class="xml">	姓：<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">v-model</span>=<span class="string">"firstName"</span> /&gt;</span></span></span><br><span class="line"><span class="xml">	名：<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">v-model</span>=<span class="string">"lastName"</span> /&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="comment">&lt;!-- 使用计算属性fullName --&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">div</span>&gt;</span>姓名：</span><span class="template-variable">&#123;&#123;fullName&#125;&#125;</span><span class="xml"> <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span></span><br><span class="line"><span class="xml">	new Vue(&#123;</span></span><br><span class="line"><span class="xml">		el: "#root",</span></span><br><span class="line"><span class="xml">		data:&#123;</span></span><br><span class="line"><span class="xml">			firstName:'',</span></span><br><span class="line"><span class="xml">			lastName:''</span></span><br><span class="line"><span class="xml">		&#125;,</span></span><br><span class="line"><span class="xml">		//在computed属性中定义计算属性fullName,</span></span><br><span class="line"><span class="xml">		//它是通过其他数据计算得到的属性</span></span><br><span class="line"><span class="xml">		//只有在依赖的属性发生变化时，计算属性才重新计算；否则就一直使用之前的缓存结果</span></span><br><span class="line"><span class="xml">		computed:&#123;</span></span><br><span class="line"><span class="xml">			fullName: function()&#123;</span></span><br><span class="line"><span class="xml">				return this.firstName + ' ' + this.lastName</span></span><br><span class="line"><span class="xml">			&#125;</span></span><br><span class="line"><span class="xml">		&#125;</span></span><br><span class="line"><span class="xml">	&#125;)</span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span></span><br></pre></td></tr></table></figure>

<p>计算属性的显示效果如下：<br><img src="/blog/images/20190920130238913.jpg" alt="计算属性的显示效果"></p>
<ol start="2">
<li>侦听器<blockquote>
<p>侦听器: 监听某一个’静态’属性或计算属性的数据的变化。一旦变化就触发对应的方法<br>侦听器定义在watch属性中</p>
</blockquote>
</li>
</ol>
<figure class="highlight django"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span></span><br><span class="line"><span class="xml">	姓：<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">v-model</span>=<span class="string">"firstName"</span> /&gt;</span></span></span><br><span class="line"><span class="xml">	名：<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">v-model</span>=<span class="string">"lastName"</span> /&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="comment">&lt;!-- 使用计算属性fullName --&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">div</span>&gt;</span>姓名：</span><span class="template-variable">&#123;&#123;fullName&#125;&#125;</span><span class="xml"> <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="comment">&lt;!-- 监听器 --&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">div</span>&gt;</span></span><span class="template-variable">&#123;&#123; count &#125;&#125;</span><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span></span><br><span class="line"><span class="xml">			new Vue(&#123;</span></span><br><span class="line"><span class="xml">				el: "#root",</span></span><br><span class="line"><span class="xml">				data:&#123;</span></span><br><span class="line"><span class="xml">					firstName:'',</span></span><br><span class="line"><span class="xml">					lastName:'',</span></span><br><span class="line"><span class="xml">					count:0</span></span><br><span class="line"><span class="xml">				&#125;,</span></span><br><span class="line"><span class="xml">				//在computed属性中定义计算属性fullName,</span></span><br><span class="line"><span class="xml">				//它是通过其他数据计算得到的属性</span></span><br><span class="line"><span class="xml">				computed:&#123;</span></span><br><span class="line"><span class="xml">					fullName: function()&#123;</span></span><br><span class="line"><span class="xml">						return this.firstName + ' ' + this.lastName</span></span><br><span class="line"><span class="xml">					&#125;</span></span><br><span class="line"><span class="xml">				&#125;,</span></span><br><span class="line"><span class="xml">				//在watch属性中定义监听器</span></span><br><span class="line"><span class="xml">				watch:&#123;</span></span><br><span class="line"><span class="xml">					//监听firstName和lastName属性</span></span><br><span class="line"><span class="xml">					firstName: function()&#123;</span></span><br><span class="line"><span class="xml">						this.count++</span></span><br><span class="line"><span class="xml">					&#125;,</span></span><br><span class="line"><span class="xml">					lastName: function()&#123;</span></span><br><span class="line"><span class="xml">						this.count++</span></span><br><span class="line"><span class="xml">					&#125;,</span></span><br><span class="line"><span class="xml">					//也可以监听计算属性fullName</span></span><br><span class="line"><span class="xml">					//fullName: function()&#123;</span></span><br><span class="line"><span class="xml">					//	this.count++</span></span><br><span class="line"><span class="xml">					//&#125;,</span></span><br><span class="line"><span class="xml">				&#125;</span></span><br><span class="line"><span class="xml">			&#125;)</span></span><br><span class="line"><span class="xml">		<span class="tag">&lt;/<span class="name">script</span>&gt;</span></span></span><br></pre></td></tr></table></figure>

<p>侦听器的显示效果如下：<br><img src="/blog/images/20190920131051024.jpg" alt="侦听器的显示效果"></p>
<h2 id="v-if-v-show与v-for指令"><a href="#v-if-v-show与v-for指令" class="headerlink" title="v-if, v-show与v-for指令"></a>v-if, v-show与v-for指令</h2><ol>
<li>v-if指令<blockquote>
<p>v-if指令：控制dom元素的存在与否————条件为true则新增该dom元素，false则删除该元素。<br>该指令会直接将dom元素从挂载点中删除或新增</p>
</blockquote>
</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">v-if</span>=<span class="string">"show"</span>&gt;</span>hello world<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">button</span> <span class="attr">type</span>=<span class="string">"button"</span> @<span class="attr">click</span>=<span class="string">"toggleTxt"</span>&gt;</span>toggle<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="actionscript">	<span class="keyword">new</span> Vue(&#123;</span></span><br><span class="line"><span class="actionscript">		el: <span class="string">"#root"</span>,</span></span><br><span class="line">		data:&#123;</span><br><span class="line"><span class="actionscript">			show:<span class="literal">true</span></span></span><br><span class="line">		&#125;,</span><br><span class="line">		methods:&#123;</span><br><span class="line"><span class="actionscript">			toggleTxt: <span class="function"><span class="keyword">function</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="actionscript">				<span class="keyword">this</span>.show = !<span class="keyword">this</span>.show</span></span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;)</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>v-if指令显示效果如下：<br><img src="/blog/images/20190920141327394.jpg" alt="v-if指令显示效果"></p>
<ol start="2">
<li>v-show指令<blockquote>
<p>v-show指令：控制dom元素的显示与否————条件为true则显示该dom元素，false则隐私该元素。<br>该指令会将dom元素通过display:none来显示或隐藏<br>v-show指令与v-if指令显示效果相同，但实现原理不同</p>
</blockquote>
</li>
</ol>
<p>v-show指令显示效果如下：<br><img src="/blog/images/20190920141925925.jpg" alt="v-show指令显示效果"></p>
<ol start="3">
<li>v-for指令<blockquote>
<p>v-for指令: 循环展示数据；同时最好使用key属性可以提升循环的性能</p>
</blockquote>
</li>
</ol>
<figure class="highlight django"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"root"</span>&gt;</span></span></span><br><span class="line"><span class="xml">    <span class="comment">&lt;!-- 2. v-for指令 --&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;<span class="name">ul</span>&gt;</span></span></span><br><span class="line"><span class="xml">		<span class="tag">&lt;<span class="name">li</span> <span class="attr">v-for</span>=<span class="string">"(item, index) in list"</span> <span class="attr">:key</span>=<span class="string">"index"</span>&gt;</span></span><span class="template-variable">&#123;&#123; item &#125;&#125;</span><span class="xml"><span class="tag">&lt;/<span class="name">li</span>&gt;</span></span></span><br><span class="line"><span class="xml">	<span class="tag">&lt;/<span class="name">ul</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span></span><br><span class="line"><span class="xml">	new Vue(&#123;</span></span><br><span class="line"><span class="xml">		el: "#root",</span></span><br><span class="line"><span class="xml">		data:&#123;</span></span><br><span class="line"><span class="xml">			show:true,</span></span><br><span class="line"><span class="xml">			list: [1,3,5]</span></span><br><span class="line"><span class="xml">		&#125;</span></span><br><span class="line"><span class="xml">	&#125;)</span></span><br><span class="line"><span class="xml"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span></span><br></pre></td></tr></table></figure>

<p>v-for指令显示效果如下：<br><img src="/blog/images/20190920142723267.jpg" alt="v-for指令显示效果"></p>

      
    </div>
    
    
    

    

    

    

    <footer class="post-footer">
      
        <div class="post-tags">
          
            <a href="/blog/tags/Vue哪儿网App实战/" rel="tag"># Vue哪儿网App实战</a>
          
        </div>
      

      
      
      

      
        <div class="post-nav">
          <div class="post-nav-next post-nav-item">
            
              <a href="/blog/2019/09/19/full-stack-dev-meituan-with-vue-seven/" rel="next" title="【第七章】Vue全家桶+SSR+Koa2全栈开发美团网">
                <i class="fa fa-chevron-left"></i> 【第七章】Vue全家桶+SSR+Koa2全栈开发美团网
              </a>
            
          </div>

          <span class="post-nav-divider"></span>

          <div class="post-nav-prev post-nav-item">
            
              <a href="/blog/2019/09/20/vue-learning-step-by-step-2/" rel="prev" title="【入门篇——第二章】Vue2.5入门到实战开发去哪儿网App——Vue组件知识">
                【入门篇——第二章】Vue2.5入门到实战开发去哪儿网App——Vue组件知识 <i class="fa fa-chevron-right"></i>
              </a>
            
          </div>
        </div>
      

      
      
    </footer>
  </div>
  
  
  
  </article>



    <div class="post-spread">
      
    </div>
  </div>


          </div>
          


          

  



        </div>
        
          
  
  <div class="sidebar-toggle">
    <div class="sidebar-toggle-line-wrap">
      <span class="sidebar-toggle-line sidebar-toggle-line-first"></span>
      <span class="sidebar-toggle-line sidebar-toggle-line-middle"></span>
      <span class="sidebar-toggle-line sidebar-toggle-line-last"></span>
    </div>
  </div>

  <aside id="sidebar" class="sidebar">
    
    <div class="sidebar-inner">

      

      
        <ul class="sidebar-nav motion-element">
          <li class="sidebar-nav-toc sidebar-nav-active" data-target="post-toc-wrap">
            文章目录
          </li>
          <li class="sidebar-nav-overview" data-target="site-overview-wrap">
            站点概览
          </li>
        </ul>
      

      <section class="site-overview-wrap sidebar-panel">
        <div class="site-overview">
          <div class="site-author motion-element" itemprop="author" itemscope itemtype="http://schema.org/Person">
            
              <p class="site-author-name" itemprop="name">aiolos</p>
              <p class="site-description motion-element" itemprop="description">Java Spring Hadoop 机器学习</p>
          </div>

          <nav class="site-state motion-element">

            
              <div class="site-state-item site-state-posts">
              
                <a href="/blog/archives/">
              
                  <span class="site-state-item-count">126</span>
                  <span class="site-state-item-name">日志</span>
                </a>
              </div>
            

            
              
              
              <div class="site-state-item site-state-categories">
                <a href="/blog/categories/index.html">
                  <span class="site-state-item-count">16</span>
                  <span class="site-state-item-name">分类</span>
                </a>
              </div>
            

            
              
              
              <div class="site-state-item site-state-tags">
                <a href="/blog/tags/index.html">
                  <span class="site-state-item-count">33</span>
                  <span class="site-state-item-name">标签</span>
                </a>
              </div>
            

          </nav>

          

          

          
          

          
          

          

        </div>
      </section>

      
      <!--noindex-->
        <section class="post-toc-wrap motion-element sidebar-panel sidebar-panel-active">
          <div class="post-toc">

            
              
            

            
              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#Vue2-5入门篇"><span class="nav-number">1.</span> <span class="nav-text">Vue2.5入门篇</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#Vue基础语法"><span class="nav-number">2.</span> <span class="nav-text">Vue基础语法</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#创建第一个Vue实例-直接用script标签引入vue-js"><span class="nav-number">2.1.</span> <span class="nav-text">创建第一个Vue实例(直接用script标签引入vue.js)</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#创建实例"><span class="nav-number">2.1.1.</span> <span class="nav-text">创建实例</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#总结Vue的使用步骤"><span class="nav-number">2.1.2.</span> <span class="nav-text">总结Vue的使用步骤</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#挂载点，模版与实例"><span class="nav-number">2.2.</span> <span class="nav-text">挂载点，模版与实例</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#Vue实例中的数据-事件和方法"><span class="nav-number">2.3.</span> <span class="nav-text">Vue实例中的数据,事件和方法</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#Vue中的属性绑定和双向数据绑定"><span class="nav-number">2.4.</span> <span class="nav-text">Vue中的属性绑定和双向数据绑定</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#Vue中的计算属性和侦听器"><span class="nav-number">2.5.</span> <span class="nav-text">Vue中的计算属性和侦听器</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#v-if-v-show与v-for指令"><span class="nav-number">2.6.</span> <span class="nav-text">v-if, v-show与v-for指令</span></a></li></ol></li></ol></div>
            

          </div>
        </section>
      <!--/noindex-->
      

      

    </div>
  </aside>


        
      </div>
    </main>

    <footer id="footer" class="footer">
      <div class="footer-inner">
        <div class="copyright">&copy; <span itemprop="copyrightYear">2020</span>
  <span class="with-love">
    <i class="fa fa-user"></i>
  </span>
  <span class="author" itemprop="copyrightHolder">aiolos</span>

  
</div>


  <div class="powered-by">由 <a class="theme-link" target="_blank" href="https://hexo.io">Hexo</a> 强力驱动</div>



  <span class="post-meta-divider">|</span>



  <div class="theme-info">主题 &mdash; <a class="theme-link" target="_blank" href="https://github.com/iissnan/hexo-theme-next">NexT.Gemini</a> v5.1.4</div>




        







        
      </div>
    </footer>

    
      <div class="back-to-top">
        <i class="fa fa-arrow-up"></i>
        
      </div>
    

    

  </div>

  

<script type="text/javascript">
  if (Object.prototype.toString.call(window.Promise) !== '[object Function]') {
    window.Promise = null;
  }
</script>









  












  
  
    <script type="text/javascript" src="/blog/lib/jquery/index.js?v=2.1.3"></script>
  

  
  
    <script type="text/javascript" src="/blog/lib/fastclick/lib/fastclick.min.js?v=1.0.6"></script>
  

  
  
    <script type="text/javascript" src="/blog/lib/jquery_lazyload/jquery.lazyload.js?v=1.9.7"></script>
  

  
  
    <script type="text/javascript" src="/blog/lib/velocity/velocity.min.js?v=1.2.1"></script>
  

  
  
    <script type="text/javascript" src="/blog/lib/velocity/velocity.ui.min.js?v=1.2.1"></script>
  

  
  
    <script type="text/javascript" src="/blog/lib/fancybox/source/jquery.fancybox.pack.js?v=2.1.5"></script>
  


  


  <script type="text/javascript" src="/blog/js/src/utils.js?v=5.1.4"></script>

  <script type="text/javascript" src="/blog/js/src/motion.js?v=5.1.4"></script>



  
  


  <script type="text/javascript" src="/blog/js/src/affix.js?v=5.1.4"></script>

  <script type="text/javascript" src="/blog/js/src/schemes/pisces.js?v=5.1.4"></script>



  
  <script type="text/javascript" src="/blog/js/src/scrollspy.js?v=5.1.4"></script>
<script type="text/javascript" src="/blog/js/src/post-details.js?v=5.1.4"></script>



  


  <script type="text/javascript" src="/blog/js/src/bootstrap.js?v=5.1.4"></script>



  


  




	





  





  












  

  <script type="text/javascript">
    // Popup Window;
    var isfetched = false;
    var isXml = true;
    // Search DB path;
    var search_path = "search.xml";
    if (search_path.length === 0) {
      search_path = "search.xml";
    } else if (/json$/i.test(search_path)) {
      isXml = false;
    }
    var path = "/blog/" + search_path;
    // monitor main search box;

    var onPopupClose = function (e) {
      $('.popup').hide();
      $('#local-search-input').val('');
      $('.search-result-list').remove();
      $('#no-result').remove();
      $(".local-search-pop-overlay").remove();
      $('body').css('overflow', '');
    }

    function proceedsearch() {
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay"></div>')
        .css('overflow', 'hidden');
      $('.search-popup-overlay').click(onPopupClose);
      $('.popup').toggle();
      var $localSearchInput = $('#local-search-input');
      $localSearchInput.attr("autocapitalize", "none");
      $localSearchInput.attr("autocorrect", "off");
      $localSearchInput.focus();
    }

    // search function;
    var searchFunc = function(path, search_id, content_id) {
      'use strict';

      // start loading animation
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay">' +
          '<div id="search-loading-icon">' +
          '<i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i>' +
          '</div>' +
          '</div>')
        .css('overflow', 'hidden');
      $("#search-loading-icon").css('margin', '20% auto 0 auto').css('text-align', 'center');

      $.ajax({
        url: path,
        dataType: isXml ? "xml" : "json",
        async: true,
        success: function(res) {
          // get the contents from search data
          isfetched = true;
          $('.popup').detach().appendTo('.header-inner');
          var datas = isXml ? $("entry", res).map(function() {
            return {
              title: $("title", this).text(),
              content: $("content",this).text(),
              url: $("url" , this).text()
            };
          }).get() : res;
          var input = document.getElementById(search_id);
          var resultContent = document.getElementById(content_id);
          var inputEventFunction = function() {
            var searchText = input.value.trim().toLowerCase();
            var keywords = searchText.split(/[\s\-]+/);
            if (keywords.length > 1) {
              keywords.push(searchText);
            }
            var resultItems = [];
            if (searchText.length > 0) {
              // perform local searching
              datas.forEach(function(data) {
                var isMatch = false;
                var hitCount = 0;
                var searchTextCount = 0;
                var title = data.title.trim();
                var titleInLowerCase = title.toLowerCase();
                var content = data.content.trim().replace(/<[^>]+>/g,"");
                var contentInLowerCase = content.toLowerCase();
                var articleUrl = decodeURIComponent(data.url);
                var indexOfTitle = [];
                var indexOfContent = [];
                // only match articles with not empty titles
                if(title != '') {
                  keywords.forEach(function(keyword) {
                    function getIndexByWord(word, text, caseSensitive) {
                      var wordLen = word.length;
                      if (wordLen === 0) {
                        return [];
                      }
                      var startPosition = 0, position = [], index = [];
                      if (!caseSensitive) {
                        text = text.toLowerCase();
                        word = word.toLowerCase();
                      }
                      while ((position = text.indexOf(word, startPosition)) > -1) {
                        index.push({position: position, word: word});
                        startPosition = position + wordLen;
                      }
                      return index;
                    }

                    indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
                    indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
                  });
                  if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
                    isMatch = true;
                    hitCount = indexOfTitle.length + indexOfContent.length;
                  }
                }

                // show search results

                if (isMatch) {
                  // sort index by position of keyword

                  [indexOfTitle, indexOfContent].forEach(function (index) {
                    index.sort(function (itemLeft, itemRight) {
                      if (itemRight.position !== itemLeft.position) {
                        return itemRight.position - itemLeft.position;
                      } else {
                        return itemLeft.word.length - itemRight.word.length;
                      }
                    });
                  });

                  // merge hits into slices

                  function mergeIntoSlice(text, start, end, index) {
                    var item = index[index.length - 1];
                    var position = item.position;
                    var word = item.word;
                    var hits = [];
                    var searchTextCountInSlice = 0;
                    while (position + word.length <= end && index.length != 0) {
                      if (word === searchText) {
                        searchTextCountInSlice++;
                      }
                      hits.push({position: position, length: word.length});
                      var wordEnd = position + word.length;

                      // move to next position of hit

                      index.pop();
                      while (index.length != 0) {
                        item = index[index.length - 1];
                        position = item.position;
                        word = item.word;
                        if (wordEnd > position) {
                          index.pop();
                        } else {
                          break;
                        }
                      }
                    }
                    searchTextCount += searchTextCountInSlice;
                    return {
                      hits: hits,
                      start: start,
                      end: end,
                      searchTextCount: searchTextCountInSlice
                    };
                  }

                  var slicesOfTitle = [];
                  if (indexOfTitle.length != 0) {
                    slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
                  }

                  var slicesOfContent = [];
                  while (indexOfContent.length != 0) {
                    var item = indexOfContent[indexOfContent.length - 1];
                    var position = item.position;
                    var word = item.word;
                    // cut out 100 characters
                    var start = position - 20;
                    var end = position + 80;
                    if(start < 0){
                      start = 0;
                    }
                    if (end < position + word.length) {
                      end = position + word.length;
                    }
                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('1');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  

  
  

  

  

  

</body>
</html>
